obligation

ChatGPT's explanation of "obligation": "Obligation" refers to the legal, moral or social responsibilities or obligations undertaken by an individual or group. This responsibility does not usually change based on personal wishes, but rather is based on social expectations or legal requirements.
For example:

Every citizen has the obligation to pay taxes to support the operation of the country.
Parents have the obligation to care for and guide their children's education.

The origin of the word "obligation" can be traced back to the ancient social structure, when people's behavior was constrained by morals and laws, forming a sense of responsibility towards others. With the development of society, the concept of obligation has gradually expanded to various social relationships, including family, work and social responsibilities.

ChatGPT definition